\(a,46-\left[\left(16+71.4\right):15\right]-2\)
\(=46-\left[\left(16+284\right):15\right]-2\)
\(=46-\left[300:15\right]-2\)
\(=46-20-2\)
\(=26-2\)
\(=24\)
\(b,\left(76.34-19.64\right):\left(38.9\right)\)
\(=\left(2584-1216\right):342\)
\(=1368:342\)
\(=4\)
\(c,98.42-\left[50.\left[\left(18-2^3\right):2+3^2\right]\right]\)
\(=98.42-\left[50.\left[\left(18-8\right):2+3^2\right]\right]\)
\(=98.42-\left[50.\left[10:2+9\right]\right]\)
\(=98.42-\left[50.\left[5+9\right]\right]\)
\(=98.42-\left[50.14\right]\)
\(=4116-700\)
\(=3416\)
\(d,-80-\left[-130-\left(12-4\right)^2\right]+2008^0\)
\(=-80-\left[-130-64\right]+2008^0\)
\(=-80+130+64+1\)
\(=50+64+1\)
\(=114+1\)
\(=115\)
\(e,1024:2^4+140:\left(38+2^5\right)-7^{23}:7^{21}\)
\(=1024:2^4+140:\left(38+32\right)-7^{23}:7^{21}\)
\(=1024:16+140:70-7^{23}:7^{21}\)
\(=64+2-49\)
\(=66-49=17\)
\(f,F=6+16+30+48+...+19600+19998\)
Số số hạng dãy số là:
\(\left(19998-6\right):4+1=4999\) (số hạng)
Tổng là :
\(\left(19998+6\right)\times4999:2=49999998\)
Đ/S:
